by Karev, Artem, Hagedorn, Peter
Published in Journal of sound and vibration (26.05.2019)

by Kovaleva, A. M.
Published in Journal of mathematical sciences (New York, N.Y.) (10.05.2024)

by Bruno, Alexander
Published in AIMS mathematics (01.01.2020)

by Bardin, Boris S.
Published in Reports on mathematical physics (01.04.2002)